Answer the following statement(s) true (T) or false (F)
1. Protist locomotion is accomplished by the contraction of muscle fibers.
2. Pollination and fertilization are essentially the same process. If pollination occurs, fertilization will follow quickly.
3. After fertilization the zygote continuously develops until an embryonic plant is formed within the seed.
4. All gymnosperms have needle-like leaves and produce some type of resin.
5. In seed plants the sporophyte has been greatly reduced in size and is typically just a few cells.
1. FALSE
2. FALSE - Pollination and fertilization are different processes that may be separated by a long delay. Pollination is the mechanical transfer of pollen from its source to a receptive area on the receiving plant. Sperm are subsequently conducted to the egg by a pollen tube, and fertilization – the joining of sperm with egg – may occur much later. For instance, in a typical pine tree fertilization follows 15 months after pollination.
3. FALSE
4. FALSE
5. FALSE
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The enzyme that has the ability to synthesize DNA from ribonucleic acid (RNA) is called:
a. DNA polymerase. b. RNAse. c. helicase. d. reverse transcriptase.
A recent (2009) example of a U.S. tariff on foreign imports which caused retaliation from trading partners was the case of a U.S. tariff imposed on Chinese
a. tire imports. b. agricultural imports. c. airplane imports. d. clothing imports.
As many as 60% of people in malaria-infected regions of Africa have the sickle-cell allele, but only about 10% of the U.S. population of African ancestry carries the allele. Malaria remains a major disease in central Africa but has not been a serious problem in the U.S. for many generations. What is/are the reason(s) for the difference in the percentages and what is a reasonable statement about future percentages?
A. The presence of malaria in Africa maintains the advantage of the heterozygous sickle-cell trait, and the prevalence of malaria will likely continue to preserve the 60% rate. B. Lack of widespread malaria in the United States would have resulted in both homozygous and heterozygous carriers of sickle cell undergoing several generations of negative selection. We should expect this to continue unless innovative therapies give all individuals an equal chance of surviving and reproducing. C. The U.S. percentage may have always been somewhat lower due to immigration from nonmalaria regions, but changes in sites and rates of immigration could occur. D. All of the choices are reasonable.
Which biome has the least primary productivity?
a. tundra b. taiga c. grassland d. desert e. tropical rain forest